Chris added, "More foot traffic for Jack London Square, for the downtown area, for all of Oakland.More vehicle traffic too. Business owners hope having a BART Station just a 15-minute walk away and other public transit will help mitigate that.

Sources inside the Longshoreman's Union also worry that placement of the stadium will shrink the Port, just when they're vying to increase shipping to Oakland.

And then there's real estate, rent in Oakland has climbed at a fantastic rate. The average apartment rents for more than 2,500 a month now. Real estate agent Tracy Tilin McKendall says be prepared to pay even more.